Chucking device for pistons



v S. D. HARTOG.

CHUCKING DEVICE FOR PISTONS.

APPLICATION FILED MAR. 23, 1918- 1,331,918. Patented Feb. 24,1920.

attached to theaface plateby screws 3 pass- UNITED. STATES PATENTOFFICE.

STEPHEN D. "HARTOG OFST;LOUIS,*MISSOUBI,4ASSIGNORTOS. D. HARTOGMANUFAC--TUBING COMPANY, IOF ST. LOUIS,"1MISSO-URI, .A CORPORATION.

.cHUcKING DEVICE Eon. PISTONS.

'a pncationfilea'mmh'zs, 191s; serierno. 224345;

V to-receive piston rings. "-Thesegrooves,&how-

ever; become worn, especially whereeccentric rings arensed; and thisrequires that-the grooves be refinished or -machined. I Such istonsare;however,provided with connecting-rods, and in order to permit the;piston to be-chiickedor held; iii-an ordinary jwork holder; it is.necessary to detach the connecting rod 'fror'n the-piston this,however, in volves considerable laborand' expense.

One oftheobj ects Iof this invention, there- 'fore ,'i's to provide a"chucking device, which is adapted to receive andhold a piston 5 with itsattached'connectingarod inplace.

- A-no'ther object is :to provide a deviceot. this kind-"adapted forpistonsand connecting-rods ofzdifierentsizcs.

PFurther objects vvillfappearfrom the detail description, taken inconnection 'Withthe accompanying? drawing, --in which *Fi'gure't is-aside elevation of the chucking device or work holder-embodying ithis, ppI be accomplished when the receiving element is removed from the carrier.16-+7.

invention; and a a p Fig.2 is a section "on the line, 2 2,Fig. 1. rReferring toithe accompanying drawing 1 designates .a -baseadapted forattachment to" a' face plate 12 of a lathe, this base being ing' throughenlarged' holes in the base, and

threaded intothe face plate, and inorder to center the base on the faceplate, this 1 face plate isprovided-With.arcentering lug 5,

adapted to" engage a corresponding ole or aperture in'the base.

Formed on or attached topthehase are a pair of side, members 6 whichterminate in "a v cylindrical support or guide .7 which is threadedtoi'receive afithread'ed collar or clamping element 8; and 'vvhi'chisfiiiished ing e1ernent8'wi11 adapt'the'device for coninteriorly toprovide a "guide for a cylindrireceiving element 10. Theelements 8 and iSpecification of'Lett ers Patent.

receive a piston of a certain size, the annusuch a; piston" being shownat l3. ce vmg element 1s further slotted. as shown at 14,{ to receivetheconnecting rod 15, and thissiotli is continuedthrough the guiderod-15.; i Byshifting t connecting rod, the receiving element 10 isPatented Fenei, 19 20.

1Ohave cooperating bevel faoesil, so to center andsupport the receivingelement 10. This receiving element 10 islprovidedwith a series ofannular seat-s12, each a'daptedito lar se'at being aflittle larger thanthe iston,

heflfce flange 9, so as to" permit the receiving ele- -ment to" beplaced on andover the connect 'ing rod. In-practice,'the slot 14' isenlarged at 16 tothewidth of theiargest connecting 'rodfor thejlargestpistonpwhilethe, bod of the slot 14 need then only be made of a Widthcorresponding to the thickness of the lar nest connecting rod. j Theclamping elementB as an enlarged rib 17 ,--vvhich is knurled on'itsouter face, and Which may also be provided with a ertnres'18, adapted tobe engaged by asuita lewrench. o a a The side members 6 are'providedwith pairs oflalinedapertures 194 and 20, adapted toreceiveaplng' 21which, in order to permit its removal orinsertion in either pair ofMined-apertures, is providedwith a knurled head Thisp1ug' 21 isadapted-toengage the crank pinwbearin 2?. on the I connecting he plug toeither alined pairof apeitnres 20, the device is adapted forconnectingrods of. different lengths.

. In ordertochuck a'piston and its attached placed over the connectingrod, which i can I The ping 21' is then passed through the center setofapeitures 19,-and the crank-pin bearing.

The piston being'seated inthe receiving ele- --mentw10,'thenclampingelement Sis rotated, thereby causing the axial. movement, of thereceiving .Ielement' 10 to clamp the. piston j firmly in itsseat; thepiston canthen be inabhined. After the machiningh'as'then bee'n'lOOcarrier, thispiston can .be removed from its 105 receiving elementthrough the slot 14.

' ln'practice' the adjustment of the clampnecting vrods of variantlengths, but Where these 'connecting'rods vary considerably it 110 isnecessary to shift the plug 21 to another pair of apertures in thecarrier, and 1t is for this purpose that a plurality of pairs ofapertures are'provided; There is, therefore,

provided in this device, means for taking care of minor varlatlons inlength of con- "necting rods, and means for taking work of majorvariations. in lengths of connecting rods. In view of the fact thatthere are many sizes of pistons varying considerably ,1n theirdiameters, 1t 1s necessary to provide various seats for thesepistons. In

practice,-therefore, the receiver 10 is pro- 7 vided with a number ofseats, and by pro- ,portin viding a number of these receiving elements,all sizes of pistons can be accommodatedon a single device, by keepingin stock a number of variant receiving elements. Due to the fact thatthe adjustment of the. receiv ing element must necessarily beconsiderable even within the major variations provided for by thedifferent pairs of apertures 19 and 20, itis necessary, to provide meansfor supthe adjustable receiving .element in its di erent positions. Itis for this purpose that the guide flange 9 is provided, which furnishesan extended bearing, and which furnishes a firm support for supportingthe receivingelement in its different positions in its carrier.

It will, therefore, be seen that the invention accomplishes its objects.The device is one which is adapted to firmly chuck or hold a piston formachining operations without requiring the detachment therefrom of itsconnecting rod. The device is so constructed that a piston maybe readilyplaced in. position and removed, and the operations can, therefore, beperformed with great rapidity. Moreover, this device is adapted topistons of variantsizes. In view of the fact that the self-centeredreceiving element is centered on the carrier through the cooperatingbevel faces 11 on the receiving element and the clamping elements,"

and in view of the fact that the carrier is 7 centered on the face plateby the plug 5 oooperating with the hole in the base of the carrier,1t isnot necessary to waste time in the usual centering operations.

It is obvious that various changes ma be made in the details ofconstruction wit out departing fromthe spirit of this invention.

It is, therefore, to be understood that this invention is-not to belimited to the specific construction shown and described.

Having thus described the invention, what is claimed is:

i 1. A work holder of the class described,

comprising, a carrier, means for seating a piston on said carrier, meansfor retaining the attached connecting rod, and means interposed betweensaid seating and retaining means adapted to clamp the seated piston.

2. A work holder of the class described,

to secure the work to tation therewith.

rotation therewith, a receiving element mounted for axial movement onsaid carrier and provided with a work-receiving seat, a work retainingelement mounted on said carrier and adapted to leave said seatunobstructed, and means for causing relative movement of said retainingelement and said receiving element. to clamp the work.

4. A work holderof the class described,

comprising, a carrier adapted for. attachment to a revolving machineelement and for rotation therewith, a receiving element 'lIlQllIlbOd'for axial movement on said car:

rier and; provided with. a series of. workrece vmg seats, av workretalnlng element and means for moving one of sa d elements relativelyto the other to clamp the work.

5. A work holder of the classdescr-ibed, comprising, a carrier adaptedfor attach ment to a revolvin machine element and for rotationtherewlth, a receiving element guided for movement in said carrier andprovided with a work-receiving seat,workretaining means on said carrierand axially within said seat, and means for moving said element adaptedto clamp the work.

6. A work holder of theclass described, comprising, a carrier adaptedforattachment to a revolving machine element and for rotation therewith,a receiving "element guided for movement 1n said carrier. and

provided with a work-receiving seat, work reta nm I means and a shiftingelement mounte on saidcarrierand engaglng said receiving element,suchshifting element and retaining means being adapted to cooperate vsaid carrier for ro- 7. *A work 'holder of the class described,

having an extension guided in said carrier and provided with awork-receiving seat,

work retaining means and ashifting element mounted-on said carrler andengaging said receiving element, such shiftingelement and retainingmeans being adapted to cooperate to secure the work to said carrier forrotation. therewith.

8. Awork holder of the classdescribed,

comprising, a carrier adapted for attachmentfo a revolving machineelement and for vrotation' therewith, a" receiving element mounted onsaid carrier and provided with a work-receiv ng seat, .a work retainermounted on said carrier and adapted to .coniprising,' a carrier. adaptedfor attach- :ment toa revolv ng machine element and for rotationtherewith, a receiving elementlie leave said work unobstructed, andmeans for moving said receiving element relatively to said retaineradapted to clamp the work.

9. A work holder of the class described, comprising, a carrier adaptedfor attachment to a revolvin machine element and for rotation therewith,a receiving element mounted on said carrier, said recelving'elementguided for movement in said carrier and provided with a Work-receivingseat and with a work receiving passage, a work retainer mounted on saidcarrier, and adapted to engage that part of the work which enters saidassage, and means for moving said receiving element adapted to clamp thework.

10. A work holder of the class described, comprising, a carrier, areceiving element mounted on said carrier, said receiving element guidedfor movement in said carrier and provided with a work-receiving seat andwith a work receivin passage, a work retamer mounted for a ustment onsaid carrier for engaging that part of, the work which enters saidpassage, and means for clamp the work. o

11. A work holder for an article having a projecting portion, suchholder being provided with a seat for the body of said article and apassage for the pro ecting portion, adjustable means for engaging andholding against withdrawal of such projecting portion, and meansinterposed between sa1d engaging means and the seat for producing aseating thrust upon said body portion.

12. A work holder for an article havin a projecting portion, such holderhavmg means for attaching the same to a revolving machine element andbeing provided with a seat for the body of said article and a passagefor the projecting portion, and ad justable means for engaglng andholding against withdrawal of such projecting portion and producing aseating thrust upon said body portion.

moving said receiving element adapted to In testimony whereof I afiix mysignature 7 this 9th day of March, 1918.

' STEPHEN D. HARTOG.

